The Minimum You Need to Know about Java on OpenVMS

Discover what is required to write real business applications on OpenVMS using Java. Java on OpenVMS covers the ugly side of Java, the Java Native Interface, so readers can more easily develop back end applications.

Requested by the industry as a follow-up to The Minimum You Need to Know to Be an OpenVMS Application Developer
Learn how to store Java source in CMS and use MMS for builds
Use Java to replace existing OpenVMS applications which use FMS,RMS,and/or RDB

Tips from the Book

Everything is a class - almost.
Passing by reference is not what you think it is, no matter what the other books tell you.
JNI_ABORT means you want to free your local copy without copying back to the Java environment.
JNI_COMMIT means you want to copy back to Java and keep your local copy. Naturally, 0 means you want to copy back to Java and free your local copy. Isn't that just obvious?


Date handling in Java is somewhat littered with land mines. Java provides you with a Date class, then tells you not to use it. When you use the classes that are supposed to replace the now depreciated Date class, you are forced to use Date objects. Use a Date object in your code where it will actually get a name and the compiler will flag a warning.